[rules-users] sliding window problem

[Wolfgang Laun]

Basically agreeing with Sotty, I'd like you to warn you about the danger
you're running into if you insert those Event facts without taking any
action in order to get rid of them after 1 minute.
-W


On 11 March 2014 19:50, Davide Sottara <dsotty at gmail.com> wrote:

>  No, the combination of accumulate/count + over should be fine (I didn't
> check though).
> The problem is that you are simply creating the Events, but not inserting
> them in the wm.
> You need to add insert(event) to your rules
>
>
>
> On 03/11/2014 07:39 PM, grules wrote:
>
>  I think you have to follow the structure of accumulate function. Like
>
> *<result pattern>* from accumulate( *<source pattern>*,
>
>                                   init( *<init code>* ),
>
>                                   action( *<action code>* ),
>
>                                   reverse( *<reverse code>* ), (optional)
>
>                                   result( *<result expression>* ) )
>
>
>
> examples are:
>
> when
>
>     $order : Order()
>
>     $total : Number( doubleValue > 100 )
>
>              from accumulate( OrderItem( order == $order, $value : value ),
>
>                               init( double total = 0; ),
>
>                               action( total += $value; ),
>
>                                      result( total ) )
>
> then
>
>     # apply discount to $order
>
> end
>
>
>
> As I understand from your code,
>
> 1.  Make List for Event class, because accumulate will loop through the
> elements of List<Event>
>
> 2.  Init (write action codes, i.e. initialize value so you will find how
> many time it got looped)
>
> 3.  Write code inside the block of action(//code here) and
>
> 4.  Update it in result block i.e. result(//update here);
>
>
>
> Being said, follow the structure 1) init, 2) action, 3) result as above..
>
>
>
>
>
>
>
>
>
> *From:* Sandhya Sree [via Drools] [mailto:ml-node+ <ml-node+>[hidden
> email] <http://user/SendEmail.jtp?type=node&node=4028640&i=0>]
> *Sent:* Tuesday, March 11, 2014 1:51 PM
> *To:* Gopu Shrestha
> *Subject:* [rules-users] sliding window problem
>
>
>
> i have a class called Event which has the following members { name,
> source, timestamp } with getters ,setters and constructor. i have a rule
> file which creates Event objects whenever a file is added / deleted in a
> particular folder. the rule file is as follows
>
>
>
> rule "new file"
>
> when
>
> $p: RuleContext( $old : getOldContext().getContainedFiles(), $new :getNewContext().getContainedFiles())
>
> RuleContext( $old != $new)
>
> accumulate( $s : Object( this not memberOf $old ) from $new, $plus : collectList( $s ) )
>
> events : Object() from $plus;
>
> then
>
> Event event = new Event("new file added",$p.getOldContext().getParent(),new Date());
>
> end
>
>
>
>
>
> rule " file deleted"
>
> when
>
> $p: RuleContext( $old : getOldContext().getContainedFiles(), $new:getNewContext().getContainedFiles())
>
> RuleContext( $old != $new)
>
> accumulate( $t : Object( this not memberOf $new ) from $old, $mins : collectList( $t ) )
>
> events : Object() from $mins;
>
> then
>
> Event event = new Event("file deleted",$p.getOldContext().getParent(),new Date());
>
> end
>
> (do not confuse with RuleContext and other unknown identifiers.. they r
> just related with other classes in the project.. these two rules just works
> fine )..i need to use a sliding time window and create another event if the
> number of file additions are > 5 over the past 1 minute. my rule file is :
>
>
>
> declare Event
>
> @role( event )
>
> end
>
>
>
>
>
> rule "More than 5 additions"
>
> when
>
> Number(intValue > 5)
>
> from    accumulate( $tick : Event ( name == "new file added" ) over window:time( 1m ),        count( $tick ) ) )
>
> then
>
>     System.out.println("too many additions");
>
> end
>
> i have enabled stream mode processing too.. but it doesnt seem to work.
> what could be the problem?
>
>
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